You do often see jar lids with strange knobs and bars and grooves and other such stuff, usually where the missing metal parts attached or hung onto or whatever-- think bail lid. Fruit jars were one of those areas of vast experimentation and attempts to get around patents by inventing other weird closure ideas. Definite jam/fruit jar lid possibility, which fits in with SAVOR of course.

Grooves and ridges on the inside of the lid means that jars van be sterilised and filled while standing on their lids.

You mean put the lids on the bottom of a pressure cooker (or etc), then set the jars on top of the lids? And the ridges would allow the steam access to the bottom of the jar? That sounds like a good idea.